Method Sub

crypto/ed25519/ecmath/point.go:30–39

Sub subtracts y from x, storing the result in z and returning that. Any or all of x, y, and z may be the same pointers.

(x, y *Point)

// Sub subtracts y from x, storing the result in z and
// returning that. Any or all of x, y, and z may be the same pointers.
func (z *Point) Sub(x, y *Point) *Point {
	var y2 edwards25519.CachedGroupElement
	(*edwards25519.ExtendedGroupElement)(y).ToCached(&y2)

	var z2 edwards25519.CompletedGroupElement
	edwards25519.GeSub(&z2, (*edwards25519.ExtendedGroupElement)(x), &y2)

	z2.ToExtended((*edwards25519.ExtendedGroupElement)(z))
	return z
}

// ScMul multiplies the EC point x by the scalar y, placing the result
// in z and returning that. X and z may be the same pointer.